How much US currency circulates in foreign countries?

As of recent estimates, approximately $1.9 trillion in U.S. currency circulates outside the United States. This includes both physical cash and other forms of U.S. dollars held by foreign entities and individuals. The dollar's status as the world's primary reserve currency contributes significantly to its widespread use in international trade and finance. Additionally, many countries adopt the U.S. dollar for their own transactions, further increasing its circulation abroad.